JP2020157967A - Resin back door - Google Patents

Abstract

To provide a resin back door which does not have a defect such as distortion of the appearance and achieves excellent recyclability and serviceability.SOLUTION: A back door 1 includes a resin inner panel 11 and a resin outer panel 12 which are disposed from an interior to an exterior of a vehicle body and overlapped with each other. In a position near a center part of the back door 1, the inner panel 11 and the outer panel 12 are engaged in at least one position by mechanical fastening means. At an outer periphery part of the back door 1, the inner panel 11 and the outer panel 12 are engaged by fastening means which can move in an outer periphery direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a resin back door.

In recent years, resin members have come to be used for the exterior members of automobiles, and these members are assembled by being bonded to each other using an adhesive (see, for example, Patent Document 1). ). When separating the resin backdoor inner panel and the outer panel, a method is performed in which a linear member such as a wire is built in the adhesive, and after the adhesive is cured, the adhesive layer is divided by the linear member. It has been proposed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2014-205491 Japanese Patent No. 4915706

However, the work of breaking the adhesive with a wire is not easy, it takes a lot of time and effort, and there is a problem in recyclability. Since it cannot be attached or detached in a non-destructive manner, it is not possible to replace and repair only the outer panel or the inner panel, and there is a problem in serviceability. In addition, by adhering the entire outer peripheral portion, problems such as appearance distortion may occur due to thermal expansion and contraction due to changes in the outside air temperature and the like. The present invention solves the above-mentioned problems, and an object of the present invention is to provide a resin back door that is free from defects such as appearance distortion and has excellent recyclability and serviceability.

In order to achieve the above object, the resin back door of the present invention is used.
In a back door having a resin inner panel and a resin outer panel that are arranged from the inside to the outside of the vehicle body and are overlapped with each other.
In the vicinity of the center of the back door, at least one of the inner panel and the outer panel is engaged by mechanical fastening means.
The outer peripheral portion of the back door is characterized in that the inner panel and the outer panel are engaged with each other by a fastening means that is movable in the outer peripheral direction.

According to the present invention, it is possible to provide a resin back door which is excellent in recyclability and serviceability without defects such as appearance distortion.

FIG. 1 is an example of a front view of a back door of an automobile. FIG. 2 is a cross-sectional view taken along the line AA in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to and limited to the following examples. It should be noted that the drawings referred to below are schematically described, and the ratio of the dimensions of the object drawn in the drawing may be different from the ratio of the dimensions of the actual object. The dimensional ratios of objects may differ between the drawings.

FIG. 1 shows a front view of an example of a back door of an automobile. FIG. 2 is a cross-sectional view taken along the line AA in FIG. The back door 1 includes a resin inner panel 11 and an outer panel 12 which are arranged from the vehicle interior inside the vehicle body toward the rear of the outside and are overlapped with each other. The back door 1 is provided with a mounting portion 20 to which accessories such as a license plate 21 and a garnish 22 are mounted near the center thereof, and mechanical fastening means such as bolts and rivets are provided at at least one place in the mounting portion 20. The inner panel 11 and the outer panel 12 are engaged with each other. The mechanical fastening means is not limited to bolts and rivets as long as it has sufficient strength and is removable.

As for the machine fastening location, for example, the inner panel 11 and the outer panel 12 may be bolted to a portion hidden by the license plate 21 (20a in the drawing), and the license plate 21 may be attached so as to cover the bolted fastening portion. The machine fastening portion is not limited to the position of the license plate, and when it is provided in another portion (for example, 20b in the drawing), the bolt fastening portion may be covered with a garnish 22 or the like.

The inner panel 11 and the outer panel 12 are engaged with each other on the outer peripheral portion of the back door 1 by a fastening means (not shown) that is movable in the outer peripheral direction. As the fastening means that is movable in the outer peripheral direction, a known fastening means can be used, and a clip (for example, one disclosed in JP-A-2004-209800) and a claw (for example, JP-A-2014-126127) can be used. (Disclosure in), slide insertion, slide nuts, stepped bolts, colored bolts, etc. All of these fastening means may be the same, or a plurality of fastening means may be used properly according to the position and shape of the back door.

In the resin back door of the present invention, the outer panel 12 of the back door 1 is movable with respect to the inner panel 11 centering on the portion where the inner panel 11 and the outer panel 12 are fixed in the mounting portion 20 (reference point). Since the fastening means is used, it is possible to fasten while allowing movements such as thermal expansion and contraction due to changes in the outside air temperature and the like. In FIG. 2, for example, when the outer panel 12 thermally expands, the outer panel 12 moves in the direction of the arrow in the drawing with respect to the inner panel 11, so that the thermal expansion can be absorbed. Therefore, it is possible to suppress defects such as appearance distortion due to thermal expansion and contraction due to changes in the outside air temperature, which have been conventionally caused by bonding the entire outer peripheral portion.

The movable direction of the fastening means that is movable in the outer peripheral direction is radial from the reference point, and the movable direction is within ± 10 ° with respect to the straight line connecting the reference point and the fastening means, preferably ± 5. Within °, more preferably within ± 3 °. Further, the movable allowance can be calculated from the coefficient of linear expansion according to the distance from the reference point.

Further, in the resin back door of the present invention, the inner panel 11 and the outer panel 12 are not fixed mainly with an adhesive as in the conventional case. Therefore, the inner panel 11 and the outer panel 12 can be easily removed by removing the bolts and the like of the machine fastening means at the attachment portion 20 fixed by the machine fastening means.

When bolts and nuts are used as the machine fastening means in the mounting portion 20, the nuts are mounted on the outer panel 12 side from the viewpoint of anti-theft property, and it is preferable to fix the nuts from the inner panel 11 side with bolts. .. Similarly, when a slide nut is used as the fastening means that is movable in the outer peripheral direction, it is preferable that the nut is attached to the outer panel 12 side and fixed with bolts from the inner panel 11 side.

It is preferable to provide a flange portion on the outer peripheral portion of the back door 1 other than at least the lower end portion, and to attach or fill the sealing material. As the sealing material, a butyl rubber-based sealing material or a foam sealing material (for example, "Ept Sealer" (trade name, manufactured by Nitto Denko KK), etc.) can be preferably used. By providing the sealing material, it is possible to prevent water or the like from entering between the inner panel 11 and the outer panel 12 and water from entering the equipment. In addition, rattling and abnormal noise between members can be prevented.

Next, a method of assembling the back door 1 will be described.

The inner panel 11 and the outer panel 12 are individually injection-molded using a mold. When assembling the back door 1, first, the inner panel 11 and the outer panel 12 are brought close to each other, and the corresponding positions of the fastening means provided on the inner panel 11 and the outer panel 12 and which are movable in the outer peripheral direction are respectively supported. Stack according to. Then, in this state, the inner panel 11 and the outer panel 12 are engaged with each other by the fastening means.

Next, the inner panel 11 and the outer panel 12 are engaged with each other by the mechanical fastening means at at least one place in the mounting portion 20. When the sealing material is provided, the sealing material may be installed on the outer peripheral flange portion before the inner panel 11 and the outer panel 12 are engaged, and may be sandwiched when the inner panel 11 and the outer panel 12 are superposed. Depending on the material of the sealing material, the sealing material may be injected between the panels after the inner panel 11 and the outer panel 12 are engaged with each other.

After integrating the inner panel 11 and the outer panel 12, the back door 1 is subjected to various assembly processes.

At the time of recycling or replacement and repair, the machine fastening means and the sealing material may be removed, and then the movable fastening means on the outer circumference may be removed.

Examples of the resin material used for the resin outer plate include PP (polypropylene) resin, PC (polycarbonate) resin, PMMA (acrylic) resin, PET (polyethylene terephthalate) resin, ABS (acrylonitrile butadiene styrene) resin, nylon 6, and nylon. Examples thereof include PA (polyamide) resin of 6, 6 and the like, AES (acrylonitrile ethylene styrene) resin, ASA (acrylonitrile styrene acrylic acid ester) resin and the like. Further, for example, these polymer alloys and fiber reinforced plastics such as PP resin containing glass tempered fibers can also be preferably used.

1 ... Back door 11 ... Inner panel 12 ... Outer panel 20 ... Mounting part 21 ... License plate 22 ... Garnish

Claims (1)

In a back door having a resin inner panel and a resin outer panel that are arranged from the inside to the outside of the vehicle body and are overlapped with each other.
In the vicinity of the center of the back door, at least one of the inner panel and the outer panel is engaged by mechanical fastening means.
At the outer peripheral portion of the back door, a resin back door is characterized in that the inner panel and the outer panel are engaged with each other by a fastening means that is movable in the outer peripheral direction.

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